Search for ACDelco 24503949. You'll come up with one of two things. One is a wiring connector and pigtail for the AC compressor. The other is a bundle of three vacuum lines. That's the one you want.
Due to it being called a "harness" it's been mis-filed by many sites under wiring. There are no aftermarket reproductions available. Apparently GM had a few million of the things made for the 1994 Century with 3100, then changed a bunch of stuff for 1996 and thus came nowhere near to using up the supply of a part made for a single model and engine combination.
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